“There are people who learn political information for reasons other than becoming better voters. Just as sports fans love to follow their favorite teams even if they cannot influence the outcomes of games, so there are also “political fans” who enjoy following political issues and cheering for their favorite candidates, parties, or ideologies.

Unfortunately, much like sports fans, political fans tend to evaluate new information in a highly biased way. They overvalue anything that supports their preexisting views, and to undervalue or ignore new data that cuts against them, even to the extent of misinterpreting simple data that they could easily interpret correctly in other contexts. Moreover, those most interested in politics are also particularly prone to discuss it only with others who agree with their views, and to follow politics only through like-minded media.”